Nibbling machine



D 1939- J. A. MURRIAN El AL 2,182,544

NIBBLING MACHINE Filed May 20, 1937 3 Sheets-Sheet 3 N M H w QW I QX Q Q ent invention.

Patented Dec. 5, 1939 NIBBLING MACHINE James A. Murrian, Kenneth J. Chapman, and Weston M. Fulton, Knoxville, Tenn, assignors to W. J. Savage Company, Inc., Knoxville, Tenn a corporation of Tennessee Application May 20, 1937, Serial No. 143,844

15 Claims. (01. 164-47) This invention relates to nibbling machines and p vide a nOVel nibbling machine Which is Cheap more particularly to that type of nibbling mato manufacture and cheap and easy to maintain. chines in which the punch carrying ram is recip- O er a d further objects of my ihVentiOn Will rocated by an eccentric. More particularly still pp as the description of my invention P this invention relates to nibbling machines of ceeds. the type in which the ram may be disengaged In the accompanying d aw s. in whi l from the action of the eccentric without stopping reference characters denote similar pa t 1 the motion of the eccentric. is a front view of one embodiment of my novel Th accompanying figures inustrate embodiinvention showing in detail the relative positions ments of my invention as applied to nibbling maf the several parts when the punch is In 611tchines but should not be considered as limitations g engagement t the Work} of my invention, reference being had, to the ap- 1S a slde new, P Sectlon; t pended claims to determine the scope of the presembodiment of my novFl mventlon Shown m 1 showing the constructlon and position of one embodiment of my novel cam means for progressively raising and lowering the ram;

Fig. 3 is a cross sectional elevation of another embodiment of my novel means for progressively raising and lowering the ram;

Fig. 4 is a front view of the novel embodiment of Fig. 3 as seen along the line 44.

From the accompanying figures it is apparent that my invention provides a novel nibbling machine having as one of its objects a new and improved stripper ring providing a shorter radius for the stripper with consequent reduction in the strain thereto;

Another object of this invention is to provide a novel nibbling machine in which my novel stripper ring may be locked in any position through a 360 degree rotation;

Another object of this invention is to provide a novel nibbling machine in which the cross head drive is in a direct line with the center of the ram with consequent increase in power'and reduction of wear; I

A still further object of this invention is to provide a novel nibbling machine in which novel means are provided for progressively raising and lowering the ram as distinguished from the instantaneous raising and lowering of the ram by gags or other means well known to the art;

A still further object of this invention is to provide a novel nibbling machine in which novel cam means are provided for progressively raising and lowering the ram;

Another and still further object of this invention is to provide a novel nibbling machine which will start its own out;

A still further object of this invention is to provide a novel nibbling machine in which the operator is not required to handle any moving parts to control the machine;

A still further object of this invention is to provide a novel nibbling machine in which no moving parts project forward of the machine to endanger the operator;

A still further object of this invention is to provide a nibbling machine having a convenience of operation not hitherto found in the art;

A still further object of this invention is to embodiment of my novel means for progressively raising and lowering the ram;

Fig. 6 is a view of the novel embodiment of Fig. 5 as seen along the line 66; and

Fig. '7 is a cross sectional elevation of still angressively raising andlowering the ram.

Now with reference to Figs. 1 and 2, i0 is any suitable frame for the machine here shown as roughly U-shaped in section. Journaled for rotation in the upper part of frame i0 is the eccentric driving shaft ll extending into a recessed portion I2 of the frame It]. Mounted upon the inner end of shaft II is reciprocating block I? designed to ride in groove M of reciprocating cross head l5 which is carried in recess l2 of frame l0. Any suitable means for lubricating reciprocating block it and groove 14 is provided as at l6. Cross head i5 is recessed as at H. Opening into recess ll and passing through cross head I5 is bearing 18 designed to receive for rotation shaft IQ of cam surface 2! Mounted upon shaft I9 is collar 25 to prohibit play between cam 20 and cross head l5. Shaft i9 is of sufficient length to pass through cap 22 which is secured to frame in and is of non-circular cross section at its upper end to engage rotatable bushing 23 which is rotatably carried by cap 22. Engaging bushing 23 for rotation thereof is hub 24 of actuating lever 25. Closing recess I1 is plate 23 secured to cross head l5 as by bolts 21. Passing through plate 26 is upper ram member 28 having a head 29 designed to engage cam '20. Upper ram member 28 is so Fig. 5 is a cross sectional elevation of another other embodiment of my novel means for pro positioned in plate 26 that its longitudinal axis if extended would pass through reciprocating block l3. Surrounding upper ram member 28 and secured to plate 26 is spring cage 30 carrying compression spring 3| which passes upward through plate 26 and engages the under surface of head 29 to force head 29 in an upward direction toward cam surface 28.

Secured to upper ram member 28 as by threads 32 is threaded member 33 having shoulders 34 formed on its upper end. Suitably spaced between threaded member 33 and spring cage 38 is stop member 35 secured to frame l8 as by bolts 38 comprising two extending. arms 31 loosely embracing upper ram member 28 and designed to engage shoulders 34 when in raised position. The position of stop member 35 between threaded member 33 and spring cage 38 is determined by the shape of cam 28. Stop member 35 is so placed that as cam 20 is rotated to disengage head 29, upper ram member 28 will be raised by spring 3| until shoulders 34 engage arms 31 of stop member 35. Further rotation of cam 28 will then cause cam 28 to disengage head 29 until the low portion 31' of cam 20 comes over head 29. Enough clearance is provided between head 29 and low portion 31' of cam 28 to allow cross head l5 to reciprocate withoutimparting movement to upper ram member 28, spring 3| acting to absorb any movement accidentally imparted to upper ram member 28 by the friction of plate 28, cage 38 or other parts. 1

Secured to threaded member 33 is ram member 38. Lock nut 39 insures complete union between ram member 38 and threaded member 33 and permits of relative adjustment therebetween. Ram member 38 terminates in any suitable means 48 for holding any suitable punch 4| and is longitudinally grooved as at 42. Ram member 38 is designed to reciprocate in a bearing 43 secured in an extension 44 of frame ID by extension member 45 and lock nut 46, lock nut 45 being secured against rotation by lock bolts 41. Extension member. 45 is annularly grooved at 48 and partially cut away as at 49. Shaped to snugly fit annular groove 48 and cut away portion 49 so as not to rotate therein is stripper ring clamp 58.

Clamp 58 carries inwardly projecting shoulders 5| at its lower end. Riding upon shoulders 5| of clamp 58 and free to rotate thereon is stripper ring 52 which is centered by the inner surfaces 53 of shoulders 5| and takes bearing only on the upper surfaces 54 of shoulders 5| and through which ram member 38 is designed to reciprocate. Stripper ring 52 is locked in position by latch 55 mounted in a projection 56 of clamp 58 and engaging any one of a plurality of holes 51 let into the upper circumference of stripper ring 52, spring 58 urging latch 55 into engagement with holes 51.

Stripper ring 52 carries lugs 59 to engage grooves 42 of ram member 38. Secured to stripper ring 52 are any suitable number of handles 68 to assist in the manual rotation of the stripper ring. Likewise secured to stripper ring 52 as by micrometer screw BI and male member 62 is stripper 83 terminating in forked arms 63' designed to loosely embrace punch 4|. Arranged beneath stripper 63 and designed to cooperate with punch 4| and suitably secured to frame I8 is any suitable work holder 64 of any desired or standard construction.

Suppose the embodiment of Figs. 1 and 2 is in the position with cam 20 rotated until the low' surface 31' is above head 29, then ram 38 can not be reciprocated. In this position punch 4| is raised by the action of spring 3| and work may be placed under stripper 63 on work holder 64. When it is desired to commence the cut in the work, shaft II is rotated by any suitable means. Rotation of shaft causes reciprocating block |3 to slide in groove M of cross head l5 and cross head I 5 is caused to reciprocate in recess |2 of frame l8. Lever 25 is then gradually rotated from the dotted position in Fig. 1 to that indicated by solid lines to bring cam 28 into gradual engagement with head 29. Gradual engagement of cam 28 with head29 causes a reciprocation of ram 38 and punch 4| that increases gradually in magnitude until head 29 is forced against plate 26. This gradual increase in magnitude of the stroke of punch 4| permits punch 4| to start its own cut without the necessity of a starting hole or other assistance and without subjecting punch 4| to overly large or dangerous strains. When cam 28 has been rotated until'head 29 engages plate 26, punch 4| is moving through its full cutting stroke. -If at any time either during the period when punch 4| is starting its out or after punch 4| has attained its full stroke it is desired to change the direction of 'the cut, latch 55 is withdrawn from hole 51 against the tension of spring 58 allowing stripper ring 52 to be rotated manually by movement of handles 80. Rotation of handles 60 causes stripper ring 52 to rotate on bearing surface 54 and at the same time to remain centered by reason of centering surfaces 53 as not to bind and hinder the reciprocation of ram 38. Rotation of stripper ring 52 acting through lugs 59 which engage grooves 42 in ram 38 rotates the entire ram assembly. Rotation of the ram assembly rotates punch 4| which in turn acts to change the direction of the cut. Stripper ring 52 is rotated until the desired direction of cut is had. Latch 55' is then released. Urged by spring 58 latch 55 enters on adjacent hole 51 in the stripper ring 52 and stripper ring 52 is locked in position and held from further rotation until latch 55 is again withdrawn.

Now with reference to Figs. 3 and 4 another embodiment of my novel nibbling machine is shown. In these figures as before, I8 represents any suitable frame of desired construction recessed at I2 and carrying an eccentric drive shaft l'l. Mounted upon the eccentric of shaft H for rotation thereon is a cross head generally indicated at I5 comprising an upper member 65 and a lower member 66 suitably secured together by bolts 66'. Lubrication of cross head |5 on shaft H is had by any suitale oiling means I 6. Lower cross head member 86 has formed thereon two projecting flanges 61 adapted to receive therebetween a tongue 68 of upper ram member 28. A bolt 89 passes through flanges 61 and tongue 68. flanges 81 and upper ram member'28 being suitably shaped to allow rotation of the several parts about bolt 69. Upper ram member 28 has formed thereon shoulders 10 to engage shoulders 1| formed on flanges 61 to permit rotation of the several parts in one direction only, clockwise as seen in Fig. 4. Secured to the outer face of cross head 15 as by bolt 69 and auxiliary bolt 12 and extending upward over the end of shaft is plate 13 having let therein a tapered non-circular opening the center of which is in line with the axis of rotation .of shaft Let in frame I8 opposite plate 13 and in line with the axis of rotation of shaft II is a circular opening 15 within which is secured a cylindrical hollow bushing 16. Mounted for rotation within bushing 16 is hub member 11 which carries a flange 18 on its inner end and any suitable rotating means on its outer end such as the operating handle 18. Let into operating handle 18 in line with the aXis of rotation of shaft H is a tapered non-circularopening 19 similar to and tapered in the reverse direction from opening M. Mounted in openings 14 and 19 is a non-circular shaft 80. Carried by upper ram member 28 in any suitable way as by threads 8|, and suitably clamped in any desired position as by spliting said ram member at 28' and tightening the clamp bolt 82, is ball member 83 which engages a suitable socket 84 in ram 38 and is held for free movement therein by cap nut 85. Ram 38 is guided in its reciprocating movement by extension 44 of frame l0.

When it is desired to raise ram 38 to disengage the punch from the work or to insert new work under the punch handle T8 is rotated in a clockwise direction as seen in Fig. 4. Rotation of handle '58 rotates shaft til which in turn acting through plate '33 rotates cross head it about the eccentric on shaft H. Rotation of cross head l5 swings bolt 69 in a clockwise direction and upper ram member 28 is carried with it pivoting about the bolt 69. Movement of upper ram member 28 acting through ball member %3 moves ram member 38 upwardly. It is to be noted that-it is not necessary to stop the rotation of shaft l i to operate handle '18 for due to the play between shaft 8|. and the tapered holes i l and 79, handle 18 has no movement imparted to it by the action of the eccentric. When it is desired to lower ram 38 to engage the punch with the work or to start a new cut, handle '18 is rotated in a counter-clockwise direction, as viewed in Fig. 4, which, acting through shaft 8% and plate it, rotates pivot bolt 69 in a counter-clockwise direction which acts to force upper ram member 28 to move ram member 33 in a downward direction until shoulders H! and H engage. It will be apparent that here again means are provided for gradually bringing ram 38 into the full length of its stroke which allows the punch to start its own cut without undue strain or damaging shocks.

With reference now to Figs. 5 and 6 which show another embodiment of novel nibbling machine, it again represents any suitable frame of desired construction recessed as at i2, and affording a suitable bearing for the eccentric drive shaft H. Mounted on the eccentric of shaft H within recess i2 is reciprocating block l3 designed to move in any suitable groove H3 let into cross head it which is mounted for reciprocation in recess l2. Suitable oiling means for the moving parts is again provided as at IS. The lower portion of cross head !5 is recessed as at H. Mounted for rotation in a horizontal plane in recess I! is member 85 designed to rotate about pivot 81 carried by cross head i5. Member 86 is circularly shaped about the pin 8'! as center and is provided with spline teeth 88 designed to receive similar teeth 89 on actuating member 90 which is mounted for rotation in the face of frame it on pin 9i. Secured to the lower surface of crosshead i5 and acting to close recess ll is spring cage 38 through which upper member 2% is designed to reciprocate. Upper ram member 28 is provided with a head 29 designed to engage member 235 when in proper position. Positioned between spring cage 3t head is compression spring 3! to urge head 25; in an upward direction toward member 853. Upper ram member 28 is threaded to engage the balance of the ram assembly and is locked in position by lock nut 92. Mounted on frame ii] between lock nut 92 and spring cage 30- is PIOjBC? tion 93 about which lever 94 is designed to pivot as at 95. Lever 94 loosely embraces upper ram member 28 as at 96 and is provided withshoul: ders 97 to engage lock'nut 92.

When the embodiment of my novel invention shown in Figs. 5 and 6 is in operation and it is tates member 56 out of engagement with head 29. Lever 94 is then released and spring 3| raises the rain assembly to its raised position, the upward movement being limited by any suitable means such as limiting the movement of lever 94. Member 85 is of sufficient thickness to leave a space between head 29 and cross head 15 when in disengaged position suilicient to allow head 29 to be raised to its upper position and yet not be struck by cross head l5 as it reciprocates, any accidental motion imparted to upper ram member 23 by friction of moving parts being effectively damped by spring 3!. This thickness of member 86 also allows splined teeth 88 to be formed of sufficient length to engage teeth 89 of member 9i during the full reciprocation of cross head l5, thereby permitting member 90 to be mounted in frame it without being subjected to any reciprocating movement. When it is desired to continue the cut or to start a new cut lever 94 is depressed, bringing shoulders 53'! into contact with lock nut 92 and head 29 is forced to the lowest position possible against the action of spring 3i. Actuating member 953 is then rotateol in a counter-clockwise direction as viewed in Fig. 6 which rotates member 86 about pivot 83 in a clockwise direction into position over head 29 and effectively engages head 29 with cross head l5 and the reciprocating movement of cross head i5 is imparted to the ram assembly.

In the embodiment of my invention shown'in Fig. 7, as before. any suitable frame it is recessed at 12 and carries an eccentric shaft H which projects into recess l2 and carries upon its inwardly projecting end reciprocating block l3 designed to ride in groove M in cross head H) which is mounted for reciprocation in recess l2. head i5 is recessed at l! to receive a cam member 98 which is rotated by a hand wheel 99 and shaft ltd passing through an appropriate slot ill! in .1

frame It and taking bearing in cross head I5. Also mounted in recess I! and designed to slide therein is head 29 of upper ram member 28. Secured to the lower surface of cross head I 5 is spring cage 38 through which upper ram member 28 is designed to slide. Surrounding upper ram member 23 within cage 36 and engaging the under surface of head 29 is compression spring 31.

Fig. '7 shows cam $8 in its raised position out of engagement with head 28 and with sufficient clearance therebetween to allow crosshead E5 to reciprocate without imparting movement to upper ram member 28, spring 3! effectively damping any movement that might be imparted to ram 28 by accidental frictional engagement with cage 3:}. When it is desired to continue or start a cut, hand wheel 99 is rotated gradually bringing cam 98 into engagement with head 25, thereby imparting a gradually increasing stroke to ram 23 until Cross the full stroke of cross head i5 is imparted to ram 28. When it is desired to raise ram 28 to stop cutting or to insert new work under the punch hand wheel 99 is rotated until cam 98 is in its raised position as shown at which time spring 3! will raise ram 28 by its action against head 29. As shaft I and hand wheel 99 reciprocate with cross head a suitable slot H]! in frame It must be provided to allow for this movement.

It will now be apparent that the present in vention provides a novel nibbling machine in which the cross head drive is in line with the center of the ram affording an increase in power and which provides a shorter radius for the stripper which may be locked in any position throughout a 360 degree rotation. It is further apparent that my invention provides a novel means for progressively raising and lowering the ram so that the nibbling machine of my invention may start its own cut and yet have a con venience of operation and ease of maintenance with no moving parts to be handled by the operator not hitherto found in the art.

To those skilled in the art it will now be apparent that changes and modifications may be made to the embodiments of my invention here described for the purposes of illustration with out departing from the scope or spirit of my invention. To determine the scope of the present invention reference should be had to the appended claims.

What is claimed is:

1. In a nibbling machine in combination with a frame, an eccentric, a cross head carried by said eccentric and mounted for reciprocation in said frame, a ram actuated by the motion of said cross head, and rotary cam means operable during the reciprocation of said cross head for engaging said cross head; and said ram.

2. In a nibbling machine, a frame, an eccentric mounted in said frame,a cross head carriedbysaid eccentric and mounted for reciprocation in said frame, a ram actuated by the motion of said cross head, and rotary cam means manually operable during the reciprocation of said cross head for adjusting the distance between said cross head and said ram.

3. In a nibbling machine, a frame, an eccentric carried by said frame, a cross head mounted on said eccentric and carried for reciprocation in said ,frame, a ram and means operable during the reciprocation of said cross head for adjusting the distance between said cross head and said ram including a rotary cam carried by said cross head, a shaft for said cam extending through said cross head parallel to the line of motion of said ram and extending through said frame, and manual means for slidingly engaging said cam shaft for rotation thereof.

4. In a nibbling machine, a frame, an eccentric mounted for rotation in said frame, a cross head mounted on said eccentric and carried for reciprocation in said frame, a ram mounted for reciprocation in said frame, shoulders on said ram, a stop carried by said frame and engaging said shoulders to limit the upward movement of said ram, means for progressively engaging and disengaging said cross head and said ram including a cam, a shaft for said cam carried by said cross head and extending therethrough parallel to the direction of motion of said ram, manual means slidingly engaging said cam shaft for rotation thereof and resilient means to engage said ram with said cam until said shoulders engage said stop, said cam being so constructed and arranged that said ram will not be actuated when said cam is completely disengaged.

5. In a nibbling machine, a frame, an eccentric mounted for rotation in said frame, a cross head mounted on said eccentric and carried for reciprocation by said frame, a ram carried by said frame and designed to reciprocate therein, the line of reciprocation of said ram passing through said eccentric and intersecting its axis of rotation, means limiting the movement of' said ram toward said cross head resilient means carried by said cross head to urge said ram toward said cross head and manual means for progressively engaging and disengaging said ram and said cross head including a cam, a shaft for said cam carried by said cross head and extending in a direction parallel to the line of reciprocation of said ram, manual means slidingly engaging said shaft for rotation thereof, said cam and said motion limiting means for said ram being so constructed and arranged that when the low surface of said cam is over said ram said ram will not be recip rocated by said cross head.

6. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, means for reciprocating said ram including cam means for adjusting the distance between said ram and said reciprocating means, and means for rotating said ram including a clamp member engaging said frame and surrounding said ram and a stripper ring engaging said ram and mounted for rotation on said clamp.

I '7. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, means for reciprocating said ram including cam means for adjusting the distance between said ram and said reciprocating means, and means for rotating said ram including a clamp member engaging said frame and surrounding said ram, inwardly projecting shoulders on the lower extremity of said clamp, a stripper ring rotatably mounted on said shoulders and'slidably engaging said ram, and means carried by said clamp to lock said ring against rotation.

8. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, longitudinal grooves adjacent the lower end of said ram, means for reciprocating said ram including cam means for adjusting the distance between said ram and said reciprocating means at will, and means for rotating said ram including a clamp member secured to said frame and sur rounding said ram, inwardly projecting shoulders on the lower extremity of said clamp, a rotatable stripper ring mounted for rotation on the upperface of said shoulders and centered by the inner face thereof within which said ram is designed to reciprocate, projections on said stripper ring engaging said grooves in said ram, manual means for rotating said stripper ring, and means carried by saidclamp to lock said stripper ring against rotation.

9. In a nibbling machine, a frame, an eccentric mounted for rotation in said frame, a cross head mounted on said eccentric for reciprocation in said frame, a recess in said cross head, a ram mounted for reciprocation in said frame and extending into said recess, resilient means carried by said cross head to urge said ram into said recess, a shaft mounted for rotation in said cross head extending at right angles to the direction of motion of said cross head and passing through said recess and said frame, a cam mounted on said shaft in said recess, and manual means on said shaft to rotate said shaft and said cam to adjust the distance between said cross head and said ram.

10. In a nibbling machine, a frame, an eccentric, a cross head mounted in said frame for reciprocation by said eccentric, a ram assembly, resilient means urging said ram assembly toward said cross head, rotary means interposed between said cross head and ram assembly for transmitting the motion of the cross head to the ram assembly, and means arranged for actuation by the operator for progressively interposing and removing said motion transmitting means and for varying the effective length of said motion transmitting means.

11. In a nibbling machine, a frame, an eccentric, a cross head mounted in said frame for reciprocation by said eccentric, a ram assembly, resilient means urging said ram assembly toward said cross head, rotary cam means interposed between said cross head and said ram assembly for transmitting the motion of said cross head to said ram assembly, said cam means being arranged for actuation by the operator for varying the effective length of said motion transmitting means.

12. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, means for reciprocating said ram including rotary means for adjusting the distance between said ram and said reciprocating means, and means for rotating said ram including a clamp member engaging said frame and surrounding said ram and a stripper ring engaging said ram and mounted for rotation on said clamp.

13. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, means for reciprocating said ram including rotary means for adjusting the distance between said ram and said reciprocating means, and means for rotating said ram including a clamp member engaging said frame and surrounding said ram, inwardly projecting shoulders on the lower extremity of said clamp, a stripper ring rotatably mounted on said shoulders and slidably engaging said ram, and means carried by said clamp to lock said ring against rotation.

14. In a nibbling machine, a frame, a ram mounted for reciprocation in said frame, longitudinal grooves adjacent the lower end of said ram, means for reciprocating said ram including rotary cam means for adjusting the distance between said ram and said reciprocating means at will, and means for rotating said ram including a clamp member secured to said frame and surrounding said ram, inwardly projecting shoulders on the lower extremity of said clamp, a rotatable stripper ring mounted for rotation on the upper face of said shoulders and centered by the inner face thereof within which said ram is designed to reciprocate, projections on said stripper ring engaging said grooves in said ram, manual means for rotating said stripper ring, and means carried by said clamp to lock said stripper ring against rotation.

15. In a nibbling machine, a frame, an eccentric mounted in said frame, a cross head carried by said eccentric and mounted for reciprocation said frame, a ram actuated by the motion of said cross head, and manually'operable rotatable means for adjusting the distance between said cross head and said ram.

JAMES A. MURRIAN. KENNETH J. CHAPMAN. WESTON M. FULTON. 

